Spring According to Humphrey (coming in 2016)
Imagination According to Humphrey
Secrets According to Humphrey
Christmas According to Humphrey
Mysteries According to Humphrey
School According to Humphrey
Holidays According to Humphrey
More Adventures According to Humphrey
Surprises According To Humphrey
Trouble According to Humphrey
Friendship According to Humphrey
The World According to Humphrey

Collected Stories
Humphrey's Bumper Book of Tiny Tales 2
Bumper Book of Humphrey's Tiny Tales
Humphrey's Book of Summer Fun
Humphrey's Book of Christmas Fun
Humphrey's Ho Ho Ho
Humphrey's Great-Great-Great Book of Stories
Humphrey's Big-Big-Big Book of Stories